Orton privides a great hint: "If your countertop is located at the slider door add to the width of the countertop where it is in front of the door. The part of the countertop in front of the door extends 3 1/2" toward the door. Makes a big difference to have the counter top wider."
TODO: Research whether drawer hardware has lengths that are compatible with our cabinet depths. Kenetube used blum. Specifically it looks like he used the "tandembox" line. Catalog is here. It appears the have slides in 16, 18, 20, and 22+ inch lengths.
It appears that blum hardware is available to support 5/8 thick cabinet/drawer faces. We need to use 5/8 because that is the max thickness for standard marine slam latches.
Drawer Cut Sizes:
ICW = "Inside Cabinet Width" = "Opening Width" = 17.25" from model AL = "Actual Cabinet Profile Length" for 20" its 19-11/16" (500mm)
BACK WIDTH = ICW - 3-7/16 = (17-4/16 - 3-7/16) = 13-13/16 BACK HEIGHT = 7-13/16
BOTTOM WIDTH = ICW - 2-15/16 = (17-4/16 - 2-15/16) = 14-5/16 BOTTOM LENGTH = AL - 15/16 = 19-11/16 - 15/16 = 18-12/16
BACK WIDTH = 13-13/16 BACK HEIGHT = 7-13/16
BOTTOM WIDTH = 14-5/16 BOTTOM LENGTH = 18-4/16